Polymorphic work around

[icemancast]

Feature request for polymorphic support. I have a need for images that is polymorphic for a resource. I tried the hasmany field but that broke the control panel.

[duncanmcclean]

I've already opened a feature request for adding Polymoprphic relationship support to Runway. Unfortunately, it will take a lot of work to implement so probably won't be added anytime soon, unless someone opens a PR.